Better than drilling holes, pitch the conduit. This is the way we keep power conduits from filling with water.Unless you use peastone and weed block roots and bugs can get in as well as any ground water. Depending on the length of the run you can pitch to the ends or the middle. Use a hand hole with 8" of stone under it. It will give you access as well as a sump for water to drain. A 12x24 handhole only cost about $40 and looks professional when done. 73 Paul

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